DE102008044064B4 - Crimping device and a method for producing a crimp connection - Google Patents

Abstract

Crimping device (100) having as crimping tools a crimping punch (120) and a crimping anvil (130), wherein a portion of a line (300) to be crimped can be received in crimping portions (201A, 201B) of a crimp (200) and between crimping dies (120). and crimping anvil (130), wherein the crimping die (120) and / or the crimping anvil (130) are movably supported relative to one another along a longitudinal axis (Y) of the crimping die (120) and the crimping anvil (130), around the section to be crimped ( 201A, 201B), characterized in that the crimping die (120) and / or the crimping emboss (130) is orthogonal to the longitudinal axis (Y) of the crimping tools (120, 130) along the crimps of the crimp when crimping in a Z-direction (200) is pivotally mounted.

Description

The invention relates to a crimping apparatus and a method for producing a crimped connection.

Electrical cables are connected at their ends with plug contacts. Thus, the electrical connections between electrical and electronic components can be made safely and inexpensively by simply plugging.

The connection between cable and plug contact is often made by so-called crimping. The crimping is used in particular for creating a homogeneous, non-detachable connection between the conductor and the connecting element, which is intended to ensure high electrical and mechanical safety. It is a well-known alternative to conventional connections such as soldering or welding.

The connector is often a plug. Usually, the plug is already attached as an electrical contact part before laying the cable by crimping to the end of a line.

With the help of crimping pliers and cables are positively connected. This usually works through a toggle, because the hand force is too weak for a permanent deformation process. In particular, in the field of RF electronics and telecommunications, this type of connection has prevailed, since in addition to the connection security also brings a considerable simplification of handling with it. The connection is generated by pressure, with precisely matched to the connecting part and conductor cross-section crimping cause a precisely predetermined deformation of the connection element and conductor. This process is usually carried out with the help of a special crimping tool.

In addition to the mechanical demands for a sufficient holding force of the strands in the crimp, these holding forces are also important for the values of the electrical resistance.

When crimping, the rebound of the crimpfs of the crimp has proven to be a problem. In the patent application WO 2005/029653 A1 the problem of spring back of the Crimpflanken or the deformed crimping is already described. The problem is that at the end of a crimping process, that is, after the complete forming of the Crimpflanken, an effect can be observed, which after opening the crimping tool, the Crimpflanken something spring open. This Rückfederweg is quite a few microns. Nevertheless, there is a risk that this springback will at least partially break up the local cold welds in the crimp which has a straight shape and that the electrical resistance will become unstable in the extreme case.

In order to influence the springback behavior in terms of crimp stability advantageous, is in WO 2005/029653 A1 proposed to divide the crimping area into three areas. The two outer areas are transformed before the middle area. For the effectiveness of the so-called 2-stage crimp but it must be noted that the contact is significantly prolonged disadvantageously by crimping. The contact material is deformed significantly above the insertion limit in the crimping area. If the two ends of the crimp are first closed in the two-stage crimp, the strand material flows in the direction of the two ends and into the middle crimp region, which is only indirectly deformed. When closing the middle crimping area, the flowability of the stranded material is limited by the closed ends of the crimp. The strand material thus tries to escape in the direction of the two outer regions of the crimp. Thus, the surface pressure is increased, whereby the springback of Crimpflanken is only partially compensated. In essence, the tight fit of the strands in the crimp is achieved solely by the frictional engagement between the strands and the Crimpflanken. In addition to the above-mentioned selective cold welding, the tight fit of the strands is essentially achieved by means of frictional engagement. This tight fit is determined by the achievable contact forces of the Crimpflanken and the given friction parameters. To further increase this tightness of the strands, for example, transverse grooves are additionally introduced into the crimp floor. The tight fit of the strands in the crimp arrangement of transverse grooves has been shown in practice, in some cases, to be inadequate.

Also known are the publications DE 14 65 162 B . US 2 692 422 A . US 3,185,952 A and the JP 2009-117 085 A which disclose further methods of attaching a crimp to a wire.

The invention has for its object to provide a crimping tool with crimping tools for crimping contact elements with a conductor and a Crimpverbindung improving in terms of mechanical and electrical stability, crimping.

The invention is based on features of a crimping device, which are mentioned in the preamble of claims 1 and 7.

It is inventively provided in conjunction with the features of the preamble of claim 1, that a crimping die and / or the crimp anvil orthogonal to its longitudinal axis is mounted pivotably along the crimped edges of the crimp when crimping in a Z direction.

In this case, the crimping tools of the crimping apparatus are changed so that at least one of the crimping tools is able to follow the movement to be performed in the previous crimping, the lifting movement of at least one of the crimping tools in the Y direction, a pivotal movement of at least one of the crimping tools along the Crimpflanken of the crimp allow.

In this case, a force which acts essentially from above or below on the crimp in a lifting and subsequent pivoting movement is applied to the region to be crimped, which improves the mechanical and electrical stability.

This type of crimping is now referred to as "stroke-swivel wedging" and ensures that after the lifting movement, the springback behavior of the Crimpflanken a crimp is almost prevented by the subsequent pivoting movement and thereby taking place "wedging". The crimp dies remain unchanged in this first embodiment over the prior art.

In a preferred embodiment of the crimping apparatus, the crimping tools (crimping die and crimping anvil) form effective surfaces via the formation of the crimping dies arranged in the crimping dies, which produce a frustoconical shape of the crimp by the lifting force acting in the longitudinal axis.

In this case acts on the crimp in a lifting movement on the seen in the Z direction side of the crimp a force. This type of crimping is referred to as a so-called "truncated cone wedging". This type of "wedging" also substantially improves the mechanical and electrical strength of the crimped connection.

This type of wedging ensures that the crimped connection tapers in the direction of the cable run (V-shaped), which increases the frictional engagement in this area and substantially increases the stability of the crimp connection, in particular when tensile forces occur on the crimped connection, and thus is improved.

The basic movements of the crimping tools within the crimping device (arrangement and direction of movement of crimping die and / or crimping anvil) remain unchanged, however, the crimping inserts are changed in order to be able to form the V-shaped active surfaces of the crimping dies for performing the "truncated cone wedging".

In the figures, this procedure is explained in more detail.

If the "Hub-Schwenk-wedging" and the "truncated cone wedging" used in combination, the respective advantages in combination are effective, since then both the springback behavior and the mechanical and electrical strength, as described, are positively influenced.

Thereby, a technique is provided in which at least one of the crimping tools is capable of the movement to be performed in the previous crimping, the lifting movement of at least one of the crimping tools in the Y direction, a pivoting movement of at least one of the crimping tools along the Crimpflanken the crimp in Z-direction acts to let follow, wherein in a combination of embodiments, the crimping die and / or the crimping anvil of the crimping tools forms effective surfaces which generate a frusto-conical shape of the crimp by the lifting force acting in the longitudinal axis.

This combination combines the "stroke-swivel wedging" of the crimping with the "truncated cone wedging", in which case both the known from the prior art movement is extended by the pivotal movement of at least one of the crimping tools as well as the crimping dies of Crimpwerkzeuge a change in shape experience the shape of the crimp dies according to the prior art.

• a) Einlegen einer Leitung und Positionierung des zu crimpenden Bereiches zwischen den Crimpwerkzeugen einer Crimpvorrichtung
• b) Crimpen des zu crimpenden Bereiches durch eine entlang einer Längsachse Y des Crimpstempels und/oder des Crimpamboss erfolgende Hubbewegung, gekennzeichnet durch
• c) Schwenken des Crimpstempels und/oder des Crimpamboss orthogonal zur Längsachse Y um die X-Achse, entlang der beim Crimpen in einer Z-Richtung verlaufenden Crimpflanken.

The object of the invention is achieved by a method for connecting a region of a line to be crimped with a crimp with the following steps:

• a) Insertion of a line and positioning of the area to be crimped between the crimping tools of a crimping device
• b) crimping the region to be crimped by a stroke movement taking place along a longitudinal axis Y of the crimping die and / or the crimping anvil, characterized by
• c) pivoting the crimping die and / or the crimping emboss orthogonal to the longitudinal axis Y about the X-axis, along the Crimpflanken running in a Z-direction during crimping.

Further preferred embodiments of the invention will become apparent from the remaining, mentioned in the dependent claims characteristics and are explained in more detail in embodiments with reference to the accompanying drawings.

Show it:

1A a known crimping device;

1B known crimping tools of the crimping device 1 ;

2A . 2 B known crimp connections in a plan view,

3A . 3B the known crimp connections in a side view,

4A a schematic representation of the movement of a Crimpstempels relative to the crimp;

4B a side view of a crimp connection in an enlarged view after production of the crimp with a crimping device according to 4C and an associated method according to the principle of 4A ;

4C a drive solution for the crimping device;

5A a representation of the active surfaces of the crimping tools of the crimping device according to the prior art and

5B a representation of the effective surfaces of the crimping tools of the crimping apparatus in a preferred embodiment of the crimping apparatus.

1A shows a crimping device 100 according to the prior art with crimping tools 120 . 130 , As crimping tools serve a crimping punch 120 and a crimp anvil 130 , each in 1A are arranged vertically in a stroke direction in the Y direction. In this version is the crimping punch 120 agile in a leadership 110 arranged. A crimp 200 (in 1A not visible) and a cable to be crimped 300 (also not shown) are in the Z direction orthogonal to the Y direction in the crimping tools 120 . 130 inserted.

The crimped crimps of the crimp are to be crimped 200 arranged lying in the Z direction.

1B shows the crimp dies of the crimping die 120 and the crimp anvil 130 the crimping tools 120 . 130 in the prior art in a single view and a schematic view in common. The crimping insert of the crimping punch 120 has on the inner surface of a crimping contour, which is the crimp 200 against the crimp anvil 130 a crimping device 100 to 1A crimped by the lifting movement in the Y direction and the Crimpflanken lying in the Z direction in the crimping area to the crimp anvil 130 Bends.

The active surfaces designed for this purpose 120W the crimping insert of the crimping die 120 work with the active surfaces 130W of the crimp anvil 130 together and generate at least one of the two crimping tools in the Y-direction in the stroke 120 . 130 a known crimp connection.

2A shows to illustrate the invention, a crimp connection, a plug contact 400 includes, with a lead 300 by means of a crimp 200 crimped according to the prior art. In the end of the crimp 200 each is an outlet, a so-called tulip 202 , educated.

2 B shows in a plan view schematically a crimp, whose first crimping section 201A and its second crimping section 201B based on the crimping device 100 of the 1A are designed legendary in the Z direction. The Crimpflanken the crimping sections 201A . 201B are thus also in the Z direction.

3A shows the same known crimp connection 200 . 300 . 400 in a side view and in 3B this crimped connection is shown schematically, wherein in this side view only the second crimping section 201B is visible. The location of the crimped connection in a crimping device 100 but corresponds to the in 3A ,

Based on schematic representations, the explanation of the invention will be given below, the directional indications X, Y, Z always referring to the crimping device 100 , in the 1A is shown and which were also used in the following figures, are related.

4A shows a schematic diagram of the movement of a Crimpstempels 120 relative to a crimp 200 , which is shown in a side view along the Z direction.

It can be seen that the crimp stamp 120 orthogonal to the longitudinal axis Y of the crimping tools 120 . 130 is mounted pivotably about a pivot axis lying in the X direction along the Crimpflanken running in a Z-direction during crimping.

The side view of the crimp after 4B shows the crimp 200 after production with a stroke-pivot crimping device 100 with the to the crimping device 100 associated method according to the principle of 4A ,

In the exemplary embodiment, the crimping insert of the crimping die forms 120 (Also a pivoting movement of the crimp anvil 130 is suitable) active surfaces 120W off, during the pivoting movement of the crimping die 120 alternately in the Z-direction around the X-axis of the respective crimping die 120 , preferably while maintaining a tulip 202 , in the end region of the section to be crimped 201B one to each end of the crimped section 201B sloping surface (see dashed lines) generated. This will make the crimp 200 on the crimp stamp 120 facing side in the axial direction of the line 300 , By the substantially vertical from above acting lifting and pivoting forces, on the side of the crimping die 120 wedged on one side.

Both crimping inserts 120 . 130 pivoted about the X-axis after the lifting movement (not shown), there is even the possibility of crimping on both sides of the respective crimping die 120 and the crimp anvil 130 are facing, form wedged on both sides.

If necessary, for example, one-sided or two-sided also provided only in + or - Z direction pivoting of the crimping die 120 and / or the crimp anvil 130 can be effected about the X-axis so that a "lifting-swivel wedging" of the crimp connection can be formed only in a + or - direction of the Z-axis.

The preparation of a crimp according to 4A and 4B requires a crimping device 100 with at least one swiveling crimping tool 120 . 130 ,

The solution for the formation of such a crimping device is in 4C shown schematically.

Either there is one, the lifting movement of the crimping punch 120 and / or the crimp anvil 130 in the longitudinal axis Y enabling, the first drive and one, the pivoting movement in the Z-direction about the X-axis enabling, second drive independently arranged or, as in 4C shown, it is at least one of the crimping tools 120 . 130 with a kinematics 150 provided, which couples the lifting and pivoting movement using only one drive.

Preferably, only schematically illustrated thrust crank mechanism is used, which ensures that in addition to the occurring stroke along the Y-axis, a rotary movement of a crank-like drive 140 is first converted to the Y-axis in a translational movement and then in a pivoting movement, whereby in addition to the taking place in the Y direction stroke of the crimping die 120 and / or the crimp anvil 130 about the kinematics 150 a subsequent to the hub pivotal movement of the crimping die 120 and / or the crimp anvil 130 around the X-axis (pendulum motion) along the Z-axis is made possible.

For example, one revolution of the crank arm through 360 ° causes a full stroke downwards and back to the starting position, and via the connected kinematics, after the stroke downwards, a pivotal movement of the crimping die takes place 120 and / or crimp anvil 130 causes, after which the crimping die 120 and / or the crimp anvil 130 move back to the starting position.

The kinematics 150 is carried out such that a guide 110 of the pivoting tool 120 . 130 in 4C in the area of the crimping stamp 120 is arranged, as in 4C shown a guide groove, on which the kinematics 150 attacks and the crimp stamp 120 in one, depending on the desired strength of the "Hub-Schwenk-wedging", slight or more oscillating movement.

Both for the arrangement of drives that act independently of each other, as well as mechanical coupling is preferably provided that the pivotal movement of the respective drive on the crimping die 120 and / or the crimp anvil 130 directly transferable or the crimping punch 120 and / or the crimp anvil 130 in the lead 110 is held, wherein the pivoting movement of the respective drive then from there indirectly to the respective crimping tool 120 . 130 is transferable.

The method of "Hub-Schwenk-Keying" after the 4A to 4B with the help of the exemplary crimping device 100 to 1 and 4C runs as follows.

First, a) the line 300 inserted and in the crimping area between the crimping tools 120 . 130 positioned in the X and Z directions.

Subsequently, b) crimping of the region to be crimped by one along a longitudinal axis Y of the crimping die 120 and / or the crimp anvil 130 taking place lifting movement.

In a third step, c) takes place in order to avoid the springback behavior of the Crimpflanken and to improve the mechanical and electrical strength or stability of the crimp, the pivoting of the crimping die 120 and / or the crimp anvil 130 in a + and / or - Z direction about the X axis, orthogonal to the longitudinal axis Y, along the Crimpflanken running in the Z direction during crimping.

5A shows the representation of the active surfaces of the crimping tools of a crimping device according to the prior art, while 5B shows the representation of the active surfaces of other preferably shaped crimping tools of the crimping apparatus.

According to the 5A becomes a conventional straight crimp 200 which has a substantially cylindrical shape to a line 300 or a strand of wire 300 with a plug contact 400 over rectangular active surfaces 120W . 130W in the area of the crimping stamp 120 or the crimp anvil 130 crimped.

In contrast, form the crimp stamp 120 and the crimp anvil 130 in 5B preferably active surfaces 120W . 130W from, during the lifting movement of at least one of the two crimping tools 120 . 130 in the Y direction, preferably while maintaining a tulip 202 in the end region of the region to be crimped (not shown), produce a frusto-conical shape, whereby the crimp 200 in the Z direction of the stump with the smaller diameter relative to the stump with the larger diameter (seen in the Z direction) can be wedged.

As a result, in particular in combination with the "stroke-pivot wedging", it is achieved that the crimp 200 in the direction of the cable run L (V-shaped) tapers (see 5A and 5B ), which increases the friction in this area and the stability of the crimp 200 increased when pulling forces on the line. A prerequisite for the success of the "truncated cone wedging" carried out in addition to the "stroke-swivel wedging" is that the crimp 200 prefabricated as a development of a truncated cone and the crimping dies of the crimping tools 120 . 130 in terms of effective areas 120W . 130W are changed accordingly.

LIST OF REFERENCE NUMBERS

100

crimper

110

guide

120

crimping dies

120W

Effective area (s) of the crimping die

130

crimping anvil

130W

Effective area (s) of the anvil

140

Crank drive

150

kinematics

200

Crimp

201

crimping portions

201A

first crimping section

201B

second crimping section

202

Tulip / Leaks

300

management

400

plug contact

L

Direction of the cable train

X, Y, Z

Spatial directions related to the crimping device

Claims (7)

Crimping device ( 100 ), which as crimping tools a crimping punch ( 120 ) and a crimp anvil ( 130 ), wherein a region of a line to be crimped ( 300 ) in crimp sections ( 201A . 201B ) of a crimp ( 200 ) and between crimping dies ( 120 ) and crimp anvil ( 130 ) is positionable, wherein the crimping punch ( 120 ) and / or the crimp anvil ( 130 ) to each other along a longitudinal axis (Y) of the crimping die ( 120 ) and the crimp anvil ( 130 ) are movably mounted around the section to be crimped ( 201A . 201B ) crimp, characterized in that the crimping die ( 120 ) and / or the crimp anvil ( 130 ) orthogonal to the longitudinal axis (Y) of the crimping tools ( 120 . 130 ) along the crimped crimps of the crimp when crimping in a Z direction ( 200 ) is pivotally mounted. Crimping device according to claim 1, characterized in that a the lifting movement of the crimping die ( 120 ) and / or the crimp anvil ( 130 ) in the longitudinal axis (Y) enabling the first drive and, a pivotal movement of the crimping die ( 120 ) and / or the crimp anvil ( 130 ) in Z-direction enabling, second drive are arranged independently of each other or the first and the second drive for performing the stroke-pivoting movement are mechanically coupled. Crimping device according to claim 2, characterized in that the pivoting movement (s) of the first drive onto the crimping die ( 120 ) and / or the crimp anvil ( 130 ) is / are directly transferable or the crimping stamp ( 120 ) and / or the crimp anvil ( 130 ) in a guided tour ( 110 ) is held, wherein the pivoting movements of the first drive then indirectly to the respective crimping tool ( 120 . 130 ) are transferable. Crimping device according to one of claims 1 to 3, characterized in that on the crimping die ( 120 ) an effective surface ( 120W ) and / or on the crimp anvil ( 130 ) an effective surface ( 130W ) is / are formed during the pivoting movement of at least one of the two crimping tools ( 120 . 130 ) in the Z-direction about the X-axis of the respective crimping tool ( 120 . 130 ) to an end portion or to both end portions of the portion to be crimped ( 201A . 201B ) of the crimp ( 200 ) sloping surface, whereby the crimp ( 200 ) on the respective crimping tool ( 120 . 130 ) facing side one or both sides wedged. Crimping device according to claim 4, characterized in that the crimping punch ( 120 ) and the crimp anvil ( 130 ) along the longitudinal axis (Y) of the crimping die ( 120 ) and the crimp anvil ( 130 ) straight active surfaces ( 120W . 130W ) train. Crimping device according to claim 4, characterized in that the crimping punch ( 120 ) and the crimp anvil ( 130 ) along the longitudinal axis (Y) of the crimping die ( 120 ) and the crimp anvil ( 130 ) V-shaped tapered active surfaces ( 120W . 130W ) train. Method for connecting a region of a line to be crimped ( 300 ) with a crimp ( 200 ) by means of a crimping device ( 100 ) according to claim 1, which crimping tools ( 120 . 130 ), comprising the steps of: a) inserting a line ( 300 ) and positioning of the crimping area between crimping dies ( 120 ) and crimp anvil ( 130 b) crimping the region to be crimped by a along a longitudinal axis (Y) of the crimping die ( 120 ) and / or the crimp anvil ( 130 ) stroke movement, characterized by c) pivoting of the crimping die ( 120 ) and / or the crimp anvil ( 130 ) orthogonal to the longitudinal axis (Y) along the crimped crimps of the crimp when crimping in a Z direction ( 200 ).

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